Cooling device

ABSTRACT

A cooling device includes at least two cooling units, each cooling unit including a plate-shaped cold plate extending in a horizontal direction, a radiator extending in a first direction perpendicular to the horizontal direction and having a plurality of plate-shaped fins which, on the cold plate, is disposed parallel to a second direction perpendicular to the first direction, and a pump which supplies a refrigerant liquid to the cold plate and the radiator, in which the pump is adjacent to the radiator and is disposed in the second direction of the radiator, and the pump of one first cooling unit of the two cooling units faces the other second cooling unit of the two cooling units in the second direction or in a third direction orthogonal to the first direction and the second direction.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Japan patent application serialno. 2018-209524, filed on Nov. 7, 2018. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND Technical Field

The disclosure relates to a cooling device.

Description of Related Art

For example, in Patent Document 1, a conventional liquid cooling systemhas a heat receiving plate which comes into thermal contact with a heatsource and deprives the heat source of heat, radiators, a pump whichcirculates a refrigerant between the heat receiving plate and theradiators, and cooling fans which blow cooling air to the radiators. Aplurality of radiators with independent flow paths is provided, andfewer cooling fans for blowing the cooling air to the radiators areprovided than radiators.

However, in the conventional liquid cooling system, some of the coolingair may flow between the plurality of radiators. Therefore, there is apossibility that the cooling air will not be efficiently blown to theradiators.

PATENT DOCUMENTS

[Patent Document 1] Japanese Patent Laid-Open No. 2010-156467

SUMMARY

It is an objective of the disclosure to efficiently blow cooling air toa radiator and improve a cooling efficiency of the radiator.

The cooling device includes at least two cooling units, the cooling unitincludes a plate-shaped cold plate extending in a horizontal direction,a radiator extending in a first direction perpendicular to thehorizontal direction and having a plurality plate-shaped fins which, onthe cold plate, is disposed parallel to a second direction perpendicularto the first direction, and a pump which supplies a refrigerant liquidto the cold plate and the radiator, in which the pump is adjacent to theradiator and is disposed in the second direction of the radiator, andthe pump of one first cooling unit of the two cooling units faces theother second cooling unit of the two cooling units in the seconddirection or in a third direction orthogonal to the first direction andthe second direction.

An objective of the exemplary embodiment of the disclosure is to improvea cooling efficiency of a radiator.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a cooling device according to a firstexemplary embodiment of the disclosure.

FIG. 2 is a plan view of a cooling device according to a secondexemplary embodiment of the disclosure.

FIG. 3 is a plan view of a cooling device according to a third exemplaryembodiment of the disclosure.

FIG. 4 is a plan view of a cooling device according to a fourthexemplary embodiment of the disclosure.

FIG. 5 is a plan view of a cooling device according to a fifth exemplaryembodiment of the disclosure.

FIG. 6 is a plan view of a cooling device according to a sixth exemplaryembodiment of the disclosure.

DESCRIPTION OF THE EMBODIMENTS

Hereinafter, exemplary embodiments of the disclosure will be describedwith reference to the drawings. Also, in the present application, withrespect to a cold plate, a direction in which a radiator is disposed isreferred to as “upward” and a direction opposite to the direction inwhich the radiator is disposed is referred to as “downward,” therebydefining a vertical direction. In addition, in the present application,the direction in which the radiator is disposed with respect to the coldplate is referred to as a “first direction.”A direction orthogonal tothe “first direction” and in which fins are disposed in parallel isreferred to as a “second direction.” In the present application, adirection orthogonal to the “second direction” in a horizontal directionis referred to as a “third direction,” hereby a shape and a positionalrelationship of respective portions will be described. Further, adirection in which cooling air flows from an upstream side to adownstream side is indicated by an arrow in the figures. However, itshould be understood that the above definitions only define the verticaldirection and the horizontal direction for the sake of convenience ofexplanation, and do not limit directions when the cooling deviceaccording to the disclosure is manufactured and used.

Also, in the present application, a “parallel direction” includes asubstantially parallel direction. Further, in the present application, a“orthogonal direction” includes a substantially orthogonal direction.

First Embodiment

A cooling device 1 according to an exemplary embodiment of thedisclosure will be described. FIG. 1 is a perspective view of a coolingdevice according to a first exemplary embodiment of the disclosure.

The cooling device 1 has at least two cooling units. In the presentapplication, one of the two cooling units will be described as a firstcooling unit 11 and the other as a second cooling unit 12. In addition,descriptions of the second cooling unit 12 will be made only withrespect to differences from the first cooling unit 11. For the sake ofconvenience, when the second cooling unit 12 is described, portionshaving the same configurations as those of the first cooling unit 11 aredenoted by the same reference signs as those of the first cooling unit11.

The cooling units 11 and 12 have cold plates 20 and 21, radiators 22 and23, and pumps 5 and 6. The radiators 22 and 23 are disposed on the coldplates 20 and 21. Upper surfaces of the cold plates 20 and 21 are incontact with lower surfaces of the radiators 22 and 23. The pumps 5 and6 are attached to sides of the cooling units 11 and 12 in the seconddirection.

Cold Plate

The cold plates 20 and 21 are made of a metal having high thermalconductivity such as copper or aluminum and have a rectangular plateshape extending in the horizontal direction in a top view. In addition,although the cold plates 20 and 21 of the present embodiment have aquadrangular shape in a top view, they are not limited thereto, and thecold plates 20 and 21 may have, for example, a polygonal shape having aplurality of corners or a circular shape in a top view. Heat generatingcomponents 3 are disposed on lower surfaces of the cold plates 20 and21.

The cold plates 20 and 21 have first refrigerant channels (not shown)therein through which a refrigerant liquid flows. The first refrigerantchannels are spaces in the cold plates 20 and 21. A plurality of blades(not shown) disposed in parallel s provided in the first refrigerantchannel. Also, the first refrigerant channel is provided with an inlet(not shown) and an outlet shown). The refrigerant liquid that has flowedinto the first refrigerant channel through the inlet discharged from thefirst refrigerant channel through the outlet.

As the refrigerant liquid in the present embodiment, for example, anantifreeze liquid such as an ethylene glycol aqueous solution or apropylene glycol aqueous solution, pure water, or the like is used.

Radiator

The radiators 22 and 23 are disposed on the cold plates 20 and 21 toextend in the first direction perpendicular to the horizontal direction.The radiators 22 and 23 have a plurality of fins 24 and 25 for coolingand pipes (not shown). The plurality of fins 24 and 25 is formed in aplate shape, stand upright from the upper surface of the cold plates 20and 21, and are disposed in parallel in the second directionperpendicular to the first direction. The plurality of fins 24 and 25 isdisposed on the cold plates 20 and 21 at equal intervals.

Lower ends of the plurality of fins 24 and 25 are in contact with theupper surfaces of the cold plates 20 and 21. Thus, thermal conductivityfrom the cold plates 20 and 21 to the fins 24 and 25 is improved. Also,the fins 24 and 25 and the cold plates 20 and 21 may be separate membersor members formed integrally therewith. In the present embodiment, thefins 24 and 25 are separate members from the cold plate 20 and 21. Lowerends of the fins 24 and 25 are joined to the upper surfaces of the coldplates 20 and 21 by welding, for example.

In the case in which the tins 24 and 25 are members formed integrallywith the cold plates 20 and 21, the fins 24 and 25 are formed, forexample, by culling the cold plates 20 and 21. Also, in the case inwhich the fins 24 and 25 and the cold plates 20 and 21 are separatemembers, the fins 24 and 25 are preferably made of a metal having highthermal conductivity such as copper or aluminum, like the cold plates 20and 21 described above. Since the fins 24 and 25 are formed of a metalhaving high thermal conductivity like the cold plates 20 and 21, heatfrom the cold plates 20 and 21 can be efficiently transmitted to thefins 24 and 25.

The pipes (not shown) form second refrigerant channels (not shown) whichare hollow inside and through which the refrigerant liquid passes. Oneend portion of the second refrigerant channel is connected o the firstrefrigerant channel. As will be described later, the second refrigerantchannel is connected to the first refrigerant channel via a tank or apump, for example.

The pipes extend linearly in the third direction. The pipes are insertedinto through holes provided in the plurality of fins 24 and 25 and fixedto the plurality of fins 24 and 25 by welding. In this case, a directionin which the pipes extend and a direction in which the fins 24 extendare orthogonal to each other. That is, in the present embodiment, theplurality of fins 24 and 25 extends in the second direction, and thepipes extend in the third direction.

Pump

The first cooling unit 11 has a pump 5. The pump 5 of the first coolingunit 11 is disposed on one side in the second direction. The pump 5supplies the refrigerant liquid to the cold plate 20 and the radiator22.

The pump 5 is disposed adjacent to one side of the radiator 22 in thesecond direction. The pump 5 may be disposed on a side surface of asecond tank 42, which will be described later. In the presentembodiment, the pump 5 is a centrifugal pump and has a pump channel (notshown) that is a channel for the refrigerant liquid inside a rectangularparallelepiped housing. An impeller (not shown) is disposed in the pumpchannel. The pump 5 has a suction port (not shown) and a discharge port(not shown).

The suction port of the pump 5, the radiator 22, and the second channelare connected directly or indirectly to each other. The discharge portof the pump 5 is connected to the inlet of the cold plate 20. In thepresent embodiment, the suction port of the pump 5 and the radiator 22are connected to each other via the second tank 42.

The impeller of the pump 5 is supported to be rotatable about a centralaxis extending in the second direction and is connected to a rotationalshaft of a motor (not shown). The impeller rotates by driving the motor,and the refrigerant liquid that has flowed in from the suction port isdischarged from the discharge port. The pump 5 sucks the refrigerantliquid via the suction port in the direction in which the pipes extend.

The second cooling unit 12 has a pump 6. The pump 6 of the secondcooling unit 12 is disposed on the other side in the second direction.The pump 6 supplies the refrigerant liquid to the cold plate 21 and theradiator 23.

The pump 6 is disposed adjacent to the other side in the seconddirection of the radiator 23. The pump 6 may be disposed on a sidesurface of a second tank 44, which will be described later. In thepresent embodiment, the pump 6 is a centrifugal pump and has a pumpchannel (not shown) that is a channel for the refrigerant liquid insidea rectangular parallelepiped housing. An impeller (not shown) isdisposed in the pump channel. The pump 6 has a suction port (not shown)and a discharge port (not shown).

The suction port of the pump 6, the radiator 23, and the second channelare connected directly or indirectly to each other. The discharge portof the pump 6 is connected to the inlet of the cold plate 21. In thepresent embodiment, the suction port of the pump 6 and the radiator 23are connected to each other via the second tank 44.

The impeller of the pump 6 is supported to be rotatable about a centralaxis extending in the second direction and is connected to a rotationalshaft of a motor (not shown). The impeller rotates by driving the motor,and the refrigerant liquid that has flowed in from the suction port isdischarged from the discharge port. The pump 6 sucks the refrigerantliquid via the suction port in the direction in which the pipes extend.

Tank

The first cooling unit 11 further includes a first tank 41 and a secondtank 42 that store the refrigerant liquid. The first tank 41 is disposedon the other side of the first cooling unit 11 in the second direction.The second tank 42 is disposed on one side of the first cooling unit 11in the second direction. The second tank 42 is disposed between theradiator 22 and the pump 5 in the second direction. One ends of thepipes are connected to the second tank 42, and the other ends of thepipes are connected to the first tank 41. The first tank 41 and thesecond tank 42 are disposed to face each other in the direction in whichthe pipes extend. The refrigerant liquid linearly circulates smoothlyfrom the first tank 41 to the second tank 42 through the pipes.

The first tank 41 and the second tank 42 are disposed parallel to adirection in which the fins 24 are arranged, and more tins 24 can bedisposed between the first tank 41 and the second tank 42 atpredetermined intervals. Thus, a surface area of the entire fins 24 canbe enlarged, and a cooling performance of the radiator 22 can beimproved. Further, the pipes and the first tank 41 and the second tank42 can be easily connected to each other.

The pipes pass through the side surfaces of the first tank 41 and thesecond tank 42 and are directly connected to the first tank 41 and thesecond tank 42. Thus, the number of components of the cooling device 1can be reduced.

The first tank 41 and the second tank 42 are a rectangularparallelepiped. The second tank 42 is provided with a hole portion (notshown) connected to the pump 5, which will be described later.

By providing the first tank 41 and the second tank 42, an amount of therefrigerant liquid circulated in the first cooling unit 11 can beincreased. Therefore, the cooling efficiency of the first cooling unit11 is improved.

The second cooling unit 12 further includes a first tank 43 and a secondtank 44 that store the refrigerant liquid. The first tank 43 is disposedon one side of the second cooling unit 12 in the second direction. Thesecond tank 44 is disposed on the other side of the second cooling unit12 in the second direction. The second tank 44 is disposed between theradiator 23 and the pump 6 in the second direction. One ends of thepipes are connected to the first tank 43, and the other ends of thepipes are connected to the second tank 44. The first tank 43 and thesecond tank 44 are disposed to face each other in the direction in whichthe pipes extend. The refrigerant liquid linearly circulates smoothlyfrom the first tank 43 to the second tank 44 through the pipes.

The first tank 43 and the second tank 44 are disposed parallel to thedirection in which the fins 25 are arranged, and more fins 25 can bedisposed between the first tank 43 and the second tank 44 atpredetermined intervals. Thus, a surface area of the entire fins 25 canbe enlarged, and a cooling performance of the radiator 23 can beimproved. Further, the pipes and the first tank 43 and the second tank44 can be easily connected to each other.

The pipes pass through the side surfaces of the first tank 43 and thesecond tank 44 and are directly connected to the first tank 43 and thesecond tank 44. Thus, the number of components of the cooling device 1can be reduced.

The first tank 43 and the second tank 44 are a rectangularparallelepiped. The second tank 44 is provided with a hole portion (notshown) connected to the pump 6, which will be described later.

By providing the first tank 43 and the second tank 44, an amount of therefrigerant liquid circulated in the second cooling unit 12 can beincreased. Therefore, the cooling efficiency of the second cooling unit12 is improved.

Operations of Cooling Unit

In the first cooling unit 11, the heat generating component 3 to becooled such as a central processing unit (CPU) is brought into contactwith the lower surface of the cold plate 20, and the pump 5 is driven.

In this way, the refrigerant liquid circulates in the order of the firstrefrigerant channel, the first tank 41, the second refrigerant channel,and the second tank 42. Heat generated by the heat generating component3 is transmitted to the cold plate 20. The heat transmitted to the coldplate 20 is transmitted to the fins 24 through the refrigerant liquidflowing through the first refrigerant channel and the second refrigerantchannel, whereby the heat is dissipated through the fins 24 so that atemperature rise of the heat generating component 3 can be curbed. Thesame applies to the second cooling unit 12.

Blower Fan

A blower fan 28 is disposed at a position facing the first cooling unit11 or the second cooling unit 12 in the third direction. The blower fan28 of the present embodiment is an axial flow type. By blowing coolingair in a direction in which the fins 24 and 25 extend in a longitudinaldirection (the third direction), heat dissipation from the fins 24 and25 is promoted, and thus the cooling performance of the radiators 22 and23 is improved. A plurality of blower fans 28 may be disposed to facethe first cooling unit 11 or the second cooling unit 12. Also, in thepresent embodiment, one fan 28 may be disposed to face both the firstcooling unit 11 and the second cooling unit 12.

The pump 5 of the first cooling unit 11 is disposed to face the secondcooling unit 12 in the second direction.

The first cooling unit 11 and the second cooling unit 12 are disposedadjacent to each other, and the pump 5 of the first cooling unit 11 andthe second cooling unit 12 are disposed to face each other in the seconddirection, whereby a gap between the pump 5 and the second cooling unit12 in the second direction can be reduced. Therefore, it becomesdifficult for the cooling air to flow into the gap, and the cooling aircan efficiently flow into the radiators 22 and 23.

The pump 5 of the first cooling unit 11 is disposed to face the secondcooling unit 12 in the third direction orthogonal to the first directionand the second direction.

By disposing the pump 5 of the first cooling unit 11 to face the secondcooling unit 12 in the third direction orthogonal to the first directionand the second direction, a gap between the pump 5 and the cooling unit12 in the third direction can be reduced. Therefore, it becomesdifficult for the cooling air to flow into the gap, and the cooling aircan efficiently flow into the radiators 22 and 23.

The pump 5 of the first cooling unit 11 and the pump 6 of the secondcooling unit 12 are disposed to face each other in the second direction.Specifically, the pump 5 of the first cooling unit 11 is disposed on oneside in the second direction. On the other hand, the pump 6 of thesecond cooling unit 12 is disposed on the other side in the seconddirection. That is, the pump 5 and the pump 6 are respectively disposedbetween the first cooling unit 11 and the second cooling unit in thesecond direction. In the present embodiment, the pump 5 of the firstcooling unit 11 is disposed on a downstream side of the cooling air inthe third direction from the pump 6 of the second cooling unit 12.

By disposing the pump 5 and the pump 6 to face each other, the gapbetween the first cooling unit 11 and the second cooling unit 12 can bereduced. By reducing the gap between the first cooling unit 11 and thesecond cooling unit 12, the cooling air flowing in from the thirddirection is less likely to pass through the gap between the firstcooling unit 11 and the second cooling unit 12. Therefore, by disposingthe pump 5 and the pump 6 to face each other, the cooling air canefficiently flow into the radiator 22 of the first cooling unit 11 andthe radiator 23 of the second cooling unit 12.

At least a portion of the pump 5 of the first cooling unit 11 and atleast a portion of the pump 6 of the second cooling unit 12 are disposedto face each other in the third direction. Since the pump 5 and the pump6 face each other in the third direction, the gap between the pump 5 andthe pump 6 in the third direction can be reduced. Therefore, it becomesdifficult for the cooling air to enter the gap. Therefore, the coolingair can efficiently flow into the radiators 22 and 23.

In the present embodiment, the pump 5 of the first cooling unit 11 isdisposed to face the second tank 44 of the second cooling unit in thesecond direction. The pump 6 of the second cooling unit 12 is disposedto face the second tank 42 of the first cooling unit in the seconddirection. By disposing the pump 5 of the first cooling unit 11 to facethe second tank 44 of the second cooling unit 12 in the seconddirection, the gap between the pump 5 and the second tank 44 can bereduced. Further, by disposing the pump 6 of the second cooling unit 12to face the second tank 42 of the first cooling unit 11 in the seconddirection, the gap between the pump 6 and the second tank 42 can bereduced. Therefore, the cooling air is less likely to enter the gapbetween the pump 5 and the second tank 44. In addition, the cooling airis less likely to enter the gap between the pump 6 and the second tank42. Therefore, the cooling air can efficiently flow into the radiators22 and 23.

At least a portion of the pump 5 of the first cooling unit 11 and atleast a portion of the pump 6 of the second cooling unit 12 are disposedto face each other in the third direction. By disposing at least aportion of the pump 5 of the first cooling unit 11 and at least aportion of the pump 6 of the second cooling unit 12 to face each otherin the third direction, some of the cooling air flowing in between thepump 6 and the second tank 42 collides with the pump 5. Specifically,the cooling air that flows linearly from an upstream side to adownstream side in the third direction collides with an end surface ofthe pump 5 in the third direction and changes its direction to one sidein the second direction. Further, the cooling air whose direction haschanged to the one side in the second direction passes between the pump5 and the pump 6. That is, since the cooling air flowing in the thirddirection is blocked by the pump 5 and passes between the pump 5 and thepump 6, it does not flow smoothly downstream in the third direction.Accordingly, the cooling air can easily flow into the radiators 22 and23. Therefore, the cooling air can efficiently flow into the radiators22 and 23.

Also, the gap between the first cooling unit 11 and the second coolingunit 12 in the second direction is preferably narrow. For example, thegap between the first cooling unit 11 and the second cooling unit 12adjacent in the second direction is smaller than a width of each coolingunit 11 and 12 in the second direction. By narrowing the gap between thefirst cooling unit 11 and the second cooling unit 12 in the seconddirection, the cooling air can be prevented from flowing into the gap,and thus the cooling air can further flow between the fins 24 and 25 ofthe radiators 22 and 23.

Further, the pumps 5 and 6 of the present embodiment are disposed onside surfaces of the cooling units 11 and 12 in the second direction tobe positioned on one side in the third direction. As shown in FIG. 1,the pumps 5 and 6 are disposed on the side surfaces of the cooling units11 and 12 in the second direction to be positioned on the one side inthe third direction, so that the pump 5 and the pump 6 can be disposedto face each other in the third direction. Even in the case in which thedistance between the heat generating components 3 adjacent to each otheris short, the cooling units 11 and 12 can be enlarged by disposing thepump 5 and the pump 6 to face each other in the third direction. Thatis, the radiators 22 and 23 can be increased in size, and thus the heatdissipation of the heat generating component 3 can be improved.

Also, the gap between the first cooling unit 11 and the second coolingunit 12 in the second direction may be omitted. That is, the firstcooling unit 11 and the second cooling unit 12 may be disposed to be incontact with each other in the second direction. By disposing the firstcooling unit 11 and the second cooling unit 12 to be in contact witheach other in the second direction, the cooling air can be preventedfrom flowing between the cooling units, and thus the cooling air canflow into the fins 24 and 25 of the radiators 22 and 23.

In the present embodiment, a structure which is not provided with thefirst tanks 41 and 43 and the second tanks 42 and 44 may be employed. Inthe case in which the first tanks 41 and 43 and the second tanks 42 and44 are not provided, the radiator 22 of the first cooling unit 11 andthe pump 6 of the second cooling unit 12 face each other in the seconddirection, and the radiator 23 of the second cooling unit 12 and thepump 5 of the first cooling unit 110 face each other in the seconddirection. In the case in which the first tanks 41 and 43 and the secondtanks 42 and 44 are not provided, the first cooling unit 11 and thesecond cooling unit 12 can be made small.

Second Embodiment

A cooling device 1A according to a second exemplary embodiment of thedisclosure will be described. FIG. 2 is a plan view of the coolingdevice 1A according to the second exemplary embodiment. For the sake ofconvenience of explanation, portions the same as those in the firstembodiment are denoted by the same reference signs.

In the present embodiment, a pump 5A of a first cooling unit 11A and asecond cooling unit 12A are disposed adjacent to each other. The pump 5Aof the first cooling unit 11A is disposed on a downstream side of thecooling air in the third direction front a pump 6A of the second coolingunit 12A. A second tank 42A of the first cooling unit 11A and the pump6A of the second cooling unit 12A face each other in the seconddirection, and a second tank 44A of the second cooling unit 12A and thepump 5A of the first cooling unit 11A face each other in the seconddirection.

In the present embodiment, one end portion of the pump 5A of the firstcooling unit 11A in the second direction is in a position the same asthat of the other end portion of the pump 6A of the second cooling unit12A in the second direction. Specifically, when the cooling device 1A isviewed in the third direction, the position of the one end portion ofthe pump 5A in the second direction and the position of the other endportion of the pump 6A in the second direction are the same in thesecond direction. In particular, a structure in which there is no gapbetween the pump 5A and the pump 6A in the second direction when viewedfrom the third direction may be employed. Any configuration may beemployed as long as some of the cooling air flowing from between thepump 6A and the second tank 42A collides with the pump 5A and changesits direction to one side in the second direction. When viewed from thethird direction, the position of the one end portion of the pump 5A inthe second direction and the position of the other end portion of thepump 6A in the second direction are the same in the second direction,whereby the cooling air flowing from the third direction does notsmoothly flow downstream in the third direction. Accordingly, thecooling air flows into the radiators 22A and 23A, not into the gapbetween the pump 6A and the second tank 42A in the third direction.Therefore, the cooling air can efficiently flow into the radiators 22Aand 23A.

In the present embodiment, a structure which is not provided with thefirst tanks 41A and 43A and the second tanks 42A and 44A may beemployed. In the case in which the first tank 41A and 43A and the secondtank 42A and 44A are not provided, the radiator 22A of the first coolingunit 11A and the pump 6A of the second cooling unit 12A face each otherin the second direction, and the radiator 23A of the second cooling unit12A and the pump 5A of the first cooling unit 11A face each other in thesecond direction. In the case in which the first tanks 41A and 43A andthe second tank 42A and 44A are not provided, the first cooling unit 11Aand the second cooling unit 12A can be made small.

Third Embodiment

A cooling device 1B according to a third exemplary embodiment of thedisclosure will be described. FIG. 3 is a plan view of the coolingdevice 1B according to the third exemplary embodiment. For convenienceof explanation, portions the same as those in the first embodiment aredenoted by the same reference signs.

In the present embodiment, the pump 5B of the first cooling unit 11B andthe second cooling unit 12B are disposed adjacent to each other. Thepump 5B of the first cooling unit 11B and the pump 6B of the secondcooling unit 12B are disposed to face each other in the seconddirection.

Specifically, one surface of the pump 5B in the second direction and theother surface of the pump 6B in the second direction are disposed toface each other in the second direction. By disposing the pump 5B andthe pump 6B to face each other in the second direction and reducing thegap between the pump 5B and the pump 6B in the second direction, thecooling air flowing in from the third direction is less likely to passthrough the gap between the pump 5B and the pump 6B in the seconddirection. Therefore, by disposing the pump 5B and the pump 6B to faceeach other in the second direction, the cooling air can efficiently flowinto the radiator 22B of the first cooling unit 11B and the radiator 23Bof the second cooling unit 12B.

The pump 5B and the pump 6B are desirably disposed on the upstream sideof the cooling air in the third direction. When the cooling air flowsinto the gap between the pump 5B and the pump 6B, by reducing the widthof the gap in the second direction on the upstream side of the coolingair, the cooling air can be more difficult to flow into the gap, andthus the cooling air can efficiently flow into the radiators 22B and23B.

In the present embodiment, a structure which is not provided with thefirst tanks 41B and 43B and the second tanks 42B and 44B may beemployed. In the case in which the first tanks 41B and 43B and thesecond tanks 42B and 44B are not provided, the radiator 22B of the firstcooling unit 11B and the radiator 23B of the second cooling unit 12Bface each other in the second direction. In the case in which the firsttanks 41B and 43B and the second tanks 42B and 44B are not provided, thefirst cooling unit 11B and the second cooling unit 12B can be madesmall.

Fourth Embodiment

A cooling device 1C according to a fourth exemplary embodiment of thedisclosure will be described. FIG. 4 is a plan view of the coolingdevice 1C according to the fourth exemplary embodiment. For convenienceof explanation, portions the same as those in the first embodiment aredenoted by the same reference signs.

In the present embodiment, a pump 5C of a first cooling unit 11C and apump 6C of a second cooling unit 12C are disposed adjacent to each otherin the third direction. The first cooling unit 11C is disposed on adownstream side of the cooling air in the third direction from thesecond cooling unit 12C. Specifically, the pump 5C of the first coolingunit 11C is disposed on a downstream side of the cooling air in thethird direction from the pump 6C of the second cooling unit 12C.

In the present embodiment, a second tank 42C of the first cooling unit11C and a second tank 44C of the second cooling unit 12C does not faceto each other in the second direction, and the pump 5C and the pump 6Cface to each other in the third direction.

By disposing the pump 5C and the pump 6C to face each other in the thirddirection, the gap between the pump 5C and the pump 6C can be reduced.Therefore, it becomes difficult for the cooling air to flow into thegap, and thus the cooling air can efficiently flow into the radiator22C.

In the present embodiment, when viewed from the third direction, thepump 6C of the second cooling unit 12C overlaps the first tank 42C inthe second direction. When viewed from the third direction, it isdesirable that the pump 6C of the second cooling unit 12C does notoverlap the radiator 22C in the second direction. When viewed from thethird direction, the pump 6C overlaps the radiator 22C in the seconddirection, so that the pump 6C blocks some of the cooling air flowinginto the radiator 22C. Therefore, when viewed from the third direction,the pump 6C does not overlap the radiator 22C in the second direction,but overlaps the first tank 42C in the second direction, so that thecooling air can smoothly flow into the radiator 22C.

Also, in the present embodiment, a structure which is not provided withthe first tanks 41C and 43C and the second tanks 42C and 44C may beemployed. In the case in which the first tanks 41C and 43C and thesecond tanks 42C and 44C are not provided, the first cooling unit 11Cand the second cooling unit 12C can be made small. Further, even in thecase in which the first tanks 41C and 43C and the second tanks 42C and44C are not provided, it is desirable that the pump 6C and the radiator22C do not overlap in the second direction when viewed from the thirddirection.

Fifth Embodiment

A cooling device 1D according to a fifth exemplary embodiment of thedisclosure will be described. FIG. 5 is a plan view of the coolingdevice 1D according to the fifth exemplary embodiment. For convenienceof explanation, portions the same as those in the first embodiment aredenoted by the same reference signs.

In the present embodiment, a first cooling unit 11D and a second coolingunit 12D are disposed adjacent to each other. The first cooling unit 11Dis disposed on a downstream side of the cooling air in the thirddirection from the second cooling unit 12D. A pump 5D of the firstcooling unit 11D is disposed on a downstream side of the cooling air inthe third direction from a pump 6D of the second cooling unit 12D.

A portion of a second tank 42D and a portion of a second tank 44D aredisposed to face each other in the second direction. Also, the secondtank 42D and the pump 6D are disposed adjacent to each other. Bydisposing the second tank 42D and the pump 6D to be adjacent to eachother, a gap between the second tank 42D and the pump 6D can be reduced.Specifically, the second tank 42D and the pump 6D are disposed to faceeach other in the third direction. By reducing the gap between thesecond tank 42D and the pump 6D, the cooling air flowing in from thethird direction is less likely to pass through the gap between thesecond tank 42D and the pump 6D. Therefore, by disposing the second tank42D and the pump 6D to face each other in the third direction, thecooling air can efficiently flow into the radiator 22D.

It is desirable that the pump 6D does not overlap with the radiator 22Din the third direction when viewed from the upstream side of the coolingair in the third direction. Since the pump 6D and the radiator 22D donot overlap in the third direction.

It is possible to inhibit the cooling air flowing into the radiator 22Dfrom the third direction from being blocked by the pump 6D. Therefore,the cooling air can efficiently flow into the radiator 22D.

Also, in the present embodiment, a structure which is not provided withthe first tanks 41D and 43D and the second tanks 42D and 44D may beemployed. In the case in which the first tanks 41D and 43D and thesecond tanks 42D and 44D are not provided, the first cooling unit 11Dand the second cooling unit 12D can be made small. Even the case inwhich the first tanks 41D and 43D and the second tanks 42D and 44D arenot provided, it is desirable that the pump 6D and the radiator 22D donot overlap in the second direction when viewed from the thirddirection.

Sixth Embodiment

A cooling device 1E according to a sixth exemplary embodiment of thedisclosure will be described. FIG. 6 is a plan view of the coolingdevice 1E according to the sixth exemplary embodiment. For convenienceof explanation, portions the same as those in the first embodiment aredenoted by the same reference signs.

A pump 5E of a first cooling unit 11E is disposed on one side in thesecond direction. Also, a pump 6E of a second cooling unit 12E isdisposed on one side in the second direction. In the present embodiment,the pump 5E of the first cooling unit 11E and a first tank 43E of thesecond cooling unit are disposed adjacent to each other in the seconddirection. Specifically, the pump 5E and the first tank 43E are disposedto face each other in the second direction. By disposing the pump 5E andthe first tank 43E to face each other in the second direction andreducing a gap between the pump 5E and the first tank 43E in the seconddirection, the cooling air flowing in from the third direction is lesslikely to pass through the gap between the pump 5E and the first tank43E. Therefore, by disposing the pump 5E and the first tank 43E to faceeach other, the cooling air can efficiently flow into the radiator 22Eof the first cooling unit 11E and the radiator 23E of the second coolingunit 12E.

Since the pump 5E and the pump 6E do not face each other in the seconddirection, when the first cooling unit 11E and the second cooling unit12E are attached, interference between the pump 5E and the pump 6E canbe prevented, and thus damage to the cooling device 1E can be curbed.

Also, in the present embodiment, although a structure in which the pump5E and the tank 43E are disposed to face each other in the seconddirection has been described, the second cooling unit 12E may not havethe first tank 43E. In the case in which the second cooling unit 12E isnot provide with the first tank 43E, the pump 5E and the radiator 23Eface each other in the second direction.

Other

In the above embodiments, a centrifugal pump is used, but a diaphragmpump, a cascade pump, or the like may be used. Further, although anaxial flow type fan is used as the fan, for example, a centrifugal typefan or the like may be used.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the disclosed embodimentswithout departing from the scope or spirit of the disclosure. In view ofthe foregoing, it is intended that the disclosure covers modificationsand variations provided that they fall within the scope of the followingclaims and their equivalents.

What is claimed is:
 1. A cooling device comprising: a first radiatorextending in a first direction and including a plurality of first fins;a first pump to circulate refrigerant liquid; a first pump surface on aside of the first pump; a second radiator extending in the firstdirection and including a plurality of second fins; a second pump tocirculate the refrigerant liquid; and a second pump surface on a side ofthe second pump; wherein the first pump and the second pump are betweenthe first radiator and the second radiator in a second directionperpendicular or substantially perpendicular to the first direction; thefirst pump surface opposes the second pump surface in a third directionperpendicular or substantially perpendicular to both the first directionand the second direction.
 2. The cooling device according to claim 1,further comprising: a tank to store the refrigerant liquid; wherein thetank is between the first radiator and the second radiator in the seconddirection.
 3. The cooling device according to claim 2, wherein at leasta portion of the tank is between the first radiator and the first pumpin the second direction.
 4. The cooling device according to claim 1,further comprising at least one fan.
 5. The cooling device according toclaim 4, wherein the at least one fan opposes at least one of the firstradiator and the second radiator.
 6. A cooling device comprising: afirst radiator extending in a first direction and including a pluralityof first fins; a pump to circulate refrigerant liquid; a pump surface ona side of the pump; a second radiator extending in the first directionand including a plurality of second fins; a tank to store therefrigerant liquid; and a tank surface on a side of the tank; whereinthe pump and the tank are between the first radiator and the secondradiator in a second direction perpendicular or substantiallyperpendicular to the first direction; the pump surface opposes the tanksurface in a third direction perpendicular or substantiallyperpendicular to both the first direction and the second direction. 7.The cooling device according to claim 6, further comprising at least onefan.
 8. The cooling device according to claim 7, wherein the at leastone fan opposes at least one of the first radiator and the secondradiator.